Carrageenan - Solubility- and stability properties

4 important questions on Carrageenan - Solubility- and stability properties

When carrageenan is soluble, what can effect the viscosity?

An increasing concentration gives a higher viscosity.

For lambda-carrageenan, what environmental factor is important?

The amount of salt. Salt can decrease the viscosity, because salts can neutralise the some of the sulfate groups that are responsible for electrostatic repulsion (and viscosity)

How does salt influence the viscosity of kappa- and iota-carrageenan?

Small concentrations of salt can increase the viscosity because it increases interaction between molecules.
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At what pH are carrageenan solutions stable?

At high and neutral pH. At low pH, carrageenan will be partly hydrolysed due to the presence of the acid sensitive 3,6-anhydrogalactose residue.

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